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I think GHS long scale is 38" also.
Just thread a string thru, put a piece of tape around it at the tuner side of the nut, then remove it and measure from the ball to the tape to know what length you need for the 'speaking length'.

I second DR strings. I tried A bunch of strings; I just keep going back to DR's. DR are my number one Round wound strings, but that's just my opinion. If your looking for flats I Recommend the thomastik-infeld.